Filtering apparatus



Jan. 27, 1925. 1,324,419

R.M.BERRY FILTERING APPARATUS Filed June 15, 1921 I N YE T017 1? 1155211 M Bea/ ly,

WI TNESS 8) I I 1 4 v nrramvsrs Patented Jan. 27, 1925.

UNITED STATES PATENT OFFICE.

RUSSELL M. BER-RY, OF PHILADELPHIA. PENNSYLVANIA.

FILTERING APPARATUS.

Application filed June 15,

To all whom it may concern:

Be it known that I, RUSSELL M. BERRY, a citizen of the United States, and a resident of the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Im provements in Filtering Apparatus, of which the following is a specification, reference being had to the accompanying drawmg.

A principal object of my invention is to provide a filtering apparatus in which the flow ofthe liquid from a reservoir or container to the filtering medium is automatically maintained at a rate equal to that of the filtered liquid through and away from the said medium.

A further object of my invention is to provide a filtering apparatus with means preventing overflow of the liquid from the filtering medium.

A. still further object of my invention is to provide a filtering apparatus in which the liquid to be filtered is automatically fed to the filtering medium, thus avoiding constant replenishment of the liquid in the filler by the chemist, druggist or other operator A still further object of my invention to provide a filtering apparatus in which retardation of the filtering by the filling up or clogging of the filtering medium by the solid matter is substantially reduced.

A still further object of my invention is to provide a filtering apparatus in which the rate at which the material being filtered is fed or supplied to the filtering medium is automatically regulated or controlled and in which liquids throwing off steam or other vapors may be filtered.

My invention further includes all of the other various objects and novel features of construction and arrangement hereinafter more definitely specified and described.

In the accompanying drawing I have illustrated one embodiment of my invention in which Figure 1 is an elevation and partial section and Fig. 2 a fragmentary detail view in section.

The form of the invention illustrated in the drawing comprises a reservoir or container 1 which may be made of porcelain, glass, or any other suitable material, open at its top, the bottom being provided with a fiat portion 2 preferably with a down wardly sloping portion 3 terminating in 1921. Serial No. 477,627.

the neck or outlet l. I find that by making the central portion of the bottom downwardly sloping the fiow of the liquid through the outlet is assisted but it will be understood that this is not a principal feature of my invention.

A. funnel is shown at 5 which may be made of porcelain, glass or other suitable material and upon the upper edge of the funnel is formed a circumferential shoulder or flange 6, the upper surface 7 of which is preferably roughened by grinding or otherwise for the purpose hereinafter described. The under surface 8 of the fiat portion 2 of the reservoir 1 may be likewise partly or wholly roughened. In mounting the con tainer upon the funnel I have found it desirable to apply a grease or wax 9, such as vaseline or paraffine, of high viscosity to the roughened surface of the shoulder or flange 6 or to the roughened surface of the bottom 2 of the container or to both surfaces so that an. airtight joint is formed by the oppositely disposed roughened surfaces and the layer of grease therebetween. It will be understood my invention is not limited to this particular form of air-tight joint but on'iprehends any other means t ender the joint air-tight.

At 10 is shown a filtering medium which may be of filter paper. cloth, or any other suitable material, the filtering medium being disposed within the funnel in the usual manner but with its upper edge above the level of the month of the outlet or discharge neck 4.

'In carrying out the filtering by my improved invention, the container or reservoir, filtering medium and funnel having been assembled as shown in the drawing and as hereinabove described, the stem of the fun nel feeding into a receptacle, the liquid is poured into the container 1, which may be wholly or partly filled, from which it passes through the outlet 4 into the filtering medium 1Q carried by the funnel 5 until the surface of the liquid within the filtering medium rises to the level of the mouth of the outlet at at which point further rise of the liquid within the filtering medium is substantially prevented by the pressure of the air trapped in the chamber formed by the surface of the liquid within the funnel, the funnel, the outlet and the portion of the bottom of the container 1 covered by the funnel. As hereinabove indicated, the

rise. As the liquid filters through. the filtering Lme dium acorresponding amount of liquid is simultaneously discharged from the container into the filtering medium, the level of the liquid in the filtering medium remaining at .substantially the same point until all'of the liquid hasbeendischarged from the reservoir orcontainer 1.

I have also found that'owing to the fact that the air is trapped in the funnel as above described, it issubjected to a pressure per g square inchsutficient to-counterbalance the weight oi a column of the liquidhaving a heightequal to that of the level of the liquid in the reservoir or container 1. The liquid in .the funnel 5 is therefore'subjected to that pressure; vwhich is practically equal to thatofthe compressedtrapped air. The result is that the rate of filtration is rapid.

By thus being able'to maintain the level of: thefliquid in .the'. funnel up to a point close to the top edge of the filtering medium, and "thereby practically simultaneously utilizing all of therfilteringmedium, and by be maintained unbroken.

subjecting the'liquid beingfiltered to pressure as above described; the column of filtered liquid in the stem of the funnel may This is also an advantage becauseithe Weight'of the said unbroken column offiltered liquid materially assists in expediting the passage of the liquid through the filtering medium.

It Will be understood that my improved filtering apparatus is not only useful to the chemist and the druggist or to others requiring apparatus of comparatively small ca-pacity'but maybe also utilized to any scale of capacity in industrial manufacture.

While I have herein tl s 0011' siderable particularity-a referred embodiment otmy invention,- I. 0 not thereby desire oruintend to limit myself to any precise details of construction and arrangement of parts as the same may be modified and varied in minor particulars from those shown in the drawings and herein described without departing from the spirit and scope of the invention as defined in the appended claims.

'l laving thus described my invention, I claim and desiretto protect by Letters Patent ot" the Uuitedr States:

1. A filtering apparatus mmprising a :funnel, a'filtering. mediumwithin said funnel, a container seatedi upon the upper end of said funnelrand having an outlet; to ,diS- charg liquid :into said filtering medium, the contacting surfaces of said container and said tunnelbeing.roughened and; grease interposed therehetween.

2. A filtering apparatus comprising a funnel having a circunnfierential flange abouhits upper end. a filtering 1nediumwithin said funnel; a container: seated upon saidflangc and having an outlet to discharge :liquid into said filtering mediunnflthe contacting surfaces ofsaid eontainerand of said flange being roughened and. grease interposed-1mtween said contacting surfaces.

-3. iiifiltering apparatus cmnprisingi a funnel, a: filtering mediumflwithin sa-idi funnel, an open container seatedzuponzthe u per end of said funnel having an outletto isoharge liquid intoms'aid .filteringiumediumi the end of said outlet being lower. than ithe upper, edge of said filtering medium and means makingthe joint betweenrsaid container and said funnel air-:tight.

4. Afiltering apparatus comprising. a \fun nel a filteringxmedinm within said funnelr an open container seated uponthe upper endof: said tunnelihnving anontlet to discharge :liquid into. said filtering .medinm, the'end of saidontlet-being lowerithan the upper edge of said filtering medium. In Witness whereof I have hereunto, set my hand this 14th day of June. A. 11192].

RUSSELL M BERRY. 

